[jabberwock]

If you go into an Argos store and key in the code 875/9384 then they may be able to get the cubes from another store even if the store you're in doesn't have them (worked for me in Sheffield last weekend). They're only 7.99 at the moment. You can also use wire shelving panels which might be easier to locate. I found coroplast/correx hard to get hold of and expensive, but quite a few people seen to use lino successfully.

There is a section of "alternative cages" if you click on the photo gallery link to give you ideas if you decide to go the non C+C route. The main thing is to have the same space as a C+C would give you (and not to have a wooden base unless you line it with something like Correx).